[Feature Request] Expose hasNext and hasPrev in v-slide-group

[PiotrWasak]

Problem to solve

I am seeking to implement custom navigation buttons in the v-slide-group component and control their disabled state based on hasNext and hasPrev computed flags. The v-slide-group component already utilizes these flags internally, but they are not exposed, making it impossible to access them via ref. I used it like that in Vuetify 2, so that would also improve compatibility with previous version.

Proposed solution

Expose hasNext and hasPrev computed's in v-slide-group so they can be accesible by parent component.